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1 results

  • Precipitation of (Si2−xAlx)Hf in an Al–Si–Mg–Hf Alloy

  • Xueli Wang, Zhiqiang Xie, Huilan Huang, Zhihong Jia, Guang Yang, Lin Gu, Qing Liu
  • Journal:
    Microscopy and Microanalysis / Volume 23 / Issue 4 / August 2017
    Published online by Cambridge University Press:
    20 June 2017, pp. 724-729
    Print publication:
    August 2017

  • The morphology, composition, and structure of precipitates in an Al–Si–Mg–Hf alloy after heat treatment at 560°C for 20 h were studied by means of Cs-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectrometry (EDS), high-resolution transmission electron microscopy (HRTEM), and first-principle calculations. Precipitates with three kinds of morphologies were observed. The rectangular and square precipitates were predominantly (Si2−xAlx)Hf phases, while the nanobelt-like precipitate is the Si2Hf phase. First-principle calculations were used to show that the Si6 and Si8 sites were the most favorable sites for Al incorporation in the orthorhombic Si2Hf phase.